If medical nanorobots are infused into the human body, intravenously, how would one track their location?
A navigational network may be installed in the body, with stationkeeping navigational elements providing high positional accuracy to all passing nanorobots that interrogate them, wanting to know their location. Physical positions can be reported continuously using an in vivo communications network. Since the typical therapeutic dose may involve billions or trillions of nanorobots (e.g. up to a few cm3 of injection), it will usually be impractical to address nanorobots individually, though this is in principle possible for treatments involving only a few million devices, or fewer.
